Research Conference on Natural Family Planning, W., Urichie, W. A., & Natural family planning. (1973). Proceedings. Human Life Foundations.
Citazione stile Chigago Style (17a edizione)Research Conference on Natural Family Planning, Warrenton, William A. Urichie, e Natural family planning. Proceedings. Washington, D. C: Human Life Foundations, 1973.
Citatione MLA (9a ed.)Research Conference on Natural Family Planning, Warrenton, et al. Proceedings. Human Life Foundations, 1973.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.